Sprocket



FIG. 1 is a front elevational view of a sprocket showing my new design, the rear being a mirror image thereof;

FIG. 2 is an end elevational view thereof, the opposite end being a mirror image of that shown; and

FIG. 3 is a fragmentary cross-sectional view thereof taken along line 3--3 in FIG. 1. 

The ornamental design for a sprocket, as shown. 